Do you use a self signed certificate? If yes you need to edit: /etc/openldap/ldap.conf and add 3 lines:
URI ldaps://icc-ad1.custoemr.local:636 ldaps://icc-ad2.custoemr.local:636
BASE OU=HIE,DC=customer,DC=local
TLS_REQCERT allow
Replace the URI and the BASE with your data.
Hope this helps.